US 12,105,032 B1
Non-destructive testing method for article moisture content based on radio frequency identification
Yunfan Yang, Jinan (CN); and Yang Zhao, Tianjin (CN)
Assigned to Shandong University, Jinan (CN); and Civil Aviation University of China, Tianjin (CN)
Filed by Shandong University, Jinan (CN); and Civil Aviation University of China, Tianjin (CN)
Filed on Feb. 26, 2024, as Appl. No. 18/586,626.
Int. Cl. G01N 22/04 (2006.01); H01Q 1/22 (2006.01)
CPC G01N 22/04 (2013.01) [H01Q 1/2208 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A non-destructive testing method for article moisture content based on radio frequency identification (RFID), comprising the following steps:
S1, attaching an electronic tag to a surface of an article to be tested, and arranging a signal transceiver above the electronic tag;
S2, sending, by a transmitting antenna of the signal transceiver, a radio frequency (RF) signal to the electronic tag and activating the electronic tag, and simultaneously receiving a signal backscattered from an internal antenna of the electronic tag by a receiving antenna of the signal transceiver;
S3, sending the received signal to a signal processor by the signal transceiver, and processing the received signal and obtaining a real-time signal value by the signal processor;
S4, calculating a phase change value between the real-time signal value obtained in the step S3 and an initial signal value, and obtaining moisture content YNM of the article to be tested by substituting the phase change value into a moisture content fitting model formula; wherein the moisture content fitting model formula is:

OG Complex Work Unit Math
wherein A, B and C are constants at a fixed RF signal frequency, and ΔXNM represents the phase change value; and
S5, constructing a moisture content change curve of the article to be tested according to the moisture content YNM calculated in the step S4, and displaying a moisture content curve graph of the article to be tested on a moisture content monitor.